That spider tank has a ton of ways to kill you, But I've noticed that the most annoying gun by far is the one mounted on the side of the main cannon that shoots several blue explosive energy bolts in rapid succession after a brief charge up period.
You can shoot that gun right off the tank. after enough focused fire, it just pops off. after that the tank is MUCH less threatening. you no longer need to cower in fear.
So this is a message to all of you who like playing The Devil's Lair. shoot that gun off ASAP to make the rest of the fight easier. It goes way faster when you have all three guardians focusing their fire on that gun.
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Just cap way far away and scout rifle/snipe it... when it shoots, just hide... easy